Kappa Cancri

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Template:Short description

Kappa Cancri
Template:Location mark
Location of κ Cancri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer[1]
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.233[3]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type B8 IIIp[4]
B−V Template:Engvar −0.113[3]
Variable type α2 CVn[5]
Astrometry
Radial velocity (Rv)24.5±0.8[6] km/s
Proper motion (μ) RA: −18.31[2] mas/yr[2]
Dec.: −12.105 mas/yr[2]
Parallax (π)5.3209±0.1298 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)−0.82[1]
Orbit[7]
Period (P)6.3933 d
Eccentricity (e)0.13
Periastron epoch (T)2440001.95 JD
Argument of periastron (ω)
(secondary)		157°
Semi-amplitude (K1)
(primary)		67.4 km/s
Details[8]
κ Cnc A
Mass4.5 Template:Solar mass
Radius5.0 Template:Solar radius
Luminosity322[1] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[3] cgs
TemperatureScript error: No such module "val".[3] K
Metallicity [Fe/H]+0.51[1] dex
Rotational velocity (v sin i)Script error: No such module "val".[3] km/s
κ Cnc B
Mass2.1 Template:Solar mass
Radius2.4 Template:Solar radius
Surface gravity (log g)4.0 cgs
Temperature8,500 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)40 km/s
Other designations
Template:Odlist[9]
Database references
SIMBADdata

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Kappa Cancri is a blue-white hued binary star system in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from κ Cancri, and abbreviated Kappa Cnc or κ Cnc. This system is faintly visible to the naked eye as a star with an apparent visual magnitude of +5.23.[3] The magnitude difference between the two stars is about 2.6.[10] Based upon an annual parallax shift of Script error: No such module "val". as seen from the Earth,[2] the system is located approximately 610 light-years distant from the Sun. It is drifting further away with a line of sight velocity of 25 km/s.[6] The position of this system near the ecliptic means it is subject to lunar occultation.[11]

File:KappaCncLightCurve.png
A light curve for Kappa Cancri, plotted from TESS data[12]

This is a single-lined spectroscopic binary[3] star system with an orbital period of 6.39 days and an eccentricity of 0.13.[7] The primary, component A, has a stellar classification of B8 IIIp,[4] suggesting it is a B-type giant star. This a mercury-manganese star, a type of chemically peculiar star showing large overabundances of those two elements in the outer atmosphere. This indicates that it is instead a main sequence star.[3][10] It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies from magnitude +5.22 to +5.27 with a period of five days.[5]

The primary component has 4.5 times the mass of the Sun, five times the Sun's radius, and an effective temperature of Script error: No such module "val".. The secondary, component B, is a smaller star with 2.1 times the mass and 2.4 times the radius of the Sun, having an effective temperature of Script error: No such module "val"..[8]

References

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  1. ↑ a b c d Template:Cite XHIP
  2. ↑ a b c d e f Template:Cite Gaia EDR3
  3. ↑ a b c d e f g h i Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".
  9. ↑ Template:Cite simbad
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Cancer

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